Elder, John

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Elder, John

(born March 8, 1824, Glasgow, Scot.—died Sept. 17, 1869, London, Eng.) Scottish marine engineer. In 1854 he developed the marine compound steam engine (using both high- and low-pressure steam), which enabled seagoing vessels to save 30–40% of the coal they had been burning and helped make practical long voyages on which refueling was impossible.

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